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  #41  
Old 02-05-2009, 04:04 AM
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Default re. crf 450 loud rattling...

     

its not the chain on the swinging arm wen rolling with the clutch in or left standing its really noisy,,think im gonna take the top off have a look at it... what valve clearence do i need then????
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  #42  
Old 02-05-2009, 04:12 AM
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Default re.crf450

the tensioner adjuster id on the left yeah??? how do you fit another adjuster.....is it easy???
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  #43  
Old 02-05-2009, 09:02 AM
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Yes its easy to put a cam chain adjuster on but i'm not sure if theres enough space in there to get it out with out having to move some stuff out of the way...all it has is 2 bolts u have to take out. The tensioner its self is only a rod that is spring loaded and keeps tension on the chain.
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  #44  
Old 02-05-2009, 03:58 PM
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Yes you can take it off without removing anything else. I did it a few times.

If you think it's suspect, replace it with a 2006 or newer cam tensioner. They (honda) supposedly fixed it in 2005 or 2006, I forget which. I put the newer one on mine before I sold it.
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  #45  
Old 02-05-2009, 04:32 PM
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If you think it might be getting loose you can always just rewind the spring and put some more tension on it. But i wouldn't advice u 2 because you will be streching the spring.
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  #46  
Old 03-16-2009, 10:49 AM
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First off good discussion, I have a 2003 CRF450 and up until recently it has made some noise at idle but that goes away as soon as I get on the throttle. However as of last weekend after going on a 2 hour ride I noticed some more than normal noise coming from what sounded like the motor, I immediately shut down the motor and loaded the bike for the day. My engine has been running a little hotter than normal as I am having some impeller issues, but Im solving that in another thread. Anywho, I took the cam cover off yesterday and when cycling the motor it sounded like the noise was coming from the cam area??? I am totally new to these 4Strokes also and it seems very intimidating unlike the 2 strokes that i'm used to working on. Anyone have any clue what this sound could be or what may be causing it? I have about 20 hrs on a new top end that was put in prior to getting the bike. I also fired the bike up after taking a peek inside and rode it around my street and despite the sound at low rpm there is no power loss and it sounds/pulls great still.
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  #47  
Old 03-18-2009, 11:57 PM
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I would just make sure your cam chain is tight... The chains do stretch, and the tensioner does wear out.
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  #48  
Old 03-19-2009, 12:24 AM
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As does the rubbing block on the opposite side. A little wear here, a little wear there and pretty soon you have an assembly that starts to whine for some attention!

Scott
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  #49  
Old 03-19-2009, 03:58 PM
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Good point, I didn't even think about that.
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